Core bit



FIG. 1 is a perspective view of a first embodiment of a core bit, showing our new design;

FIG. 2 is front view thereof;

FIG. 3 is a perspective view of a second embodiment of a core bit;

FIG. 4 is a front view thereof;

FIG. 5 is a perspective view of a third embodiment of a core bit; and,

FIG. 6 is a front view thereof. 

CLAIM The ornamental design for a core bit, as shown and described. 